:root {
  --blue: #25266f;
  --blue-deep: #191b52;
  --blue-soft: #343689;
  --yellow: #f1c43c;
  --yellow-deep: #d9a821;
  --green: #0b8b47;
  --red: #d43632;
  --ink: #282b32;
  --muted: #666b73;
  --line: #dde0e5;
  --paper: #ffffff;
  --soft: #f5f6f8;
  --max: 1180px;
  --shadow: 0 18px 42px rgba(23, 31, 69, 0.13);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; color: var(--ink); background: var(--paper); font-family: "Noto Sans SC", "Microsoft YaHei", "PingFang SC", Arial, sans-serif; font-size: 16px; line-height: 1.72; -webkit-font-smoothing: antialiased; }
a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }
button, input, textarea { font: inherit; }
button { color: inherit; }
.container { width: min(var(--max), calc(100% - 40px)); margin: 0 auto; }
.hidden { display: none !important; }

.corporate-head { background: #fff; border-top: 4px solid var(--blue); }
.corporate-inner { min-height: 90px; display: flex; align-items: center; justify-content: space-between; gap: 32px; }
.corporate-brand { min-width: 0; display: flex; align-items: center; gap: 18px; }
.legacy-marks { display: flex; align-items: center; gap: 8px; flex: 0 0 auto; }
.legacy-marks img:first-child { width: 90px; height: 45px; object-fit: contain; }
.legacy-marks img:last-child { width: 68px; height: 52px; object-fit: contain; }
.company-name { min-width: 0; }
.company-name strong { display: block; color: var(--blue); font-size: 24px; line-height: 1.25; font-weight: 800; white-space: nowrap; }
.company-name small { display: block; color: #3f477d; font-size: 11px; line-height: 1.4; margin-top: 3px; font-family: Arial, sans-serif; }
.service-block { display: flex; align-items: center; gap: 12px; color: #4c5059; flex: 0 0 auto; }
.service-icon { width: 42px; height: 42px; border: 2px solid #9da2aa; border-radius: 50%; display: grid; place-items: center; color: var(--blue); font-size: 20px; }
.service-block > span:last-child { display: grid; grid-template-columns: auto auto; align-items: baseline; column-gap: 12px; }
.service-block small { font-size: 13px; color: #777b83; }
.service-block strong { color: #222737; font-size: 24px; font-family: Arial, sans-serif; letter-spacing: 0.02em; }
.service-block em { grid-column: 2; font-size: 12px; color: #777b83; font-style: normal; }

.site-header { position: sticky; top: 0; z-index: 50; background: var(--blue); box-shadow: 0 4px 14px rgba(21, 23, 73, 0.18); }
.nav { min-height: 52px; display: flex; align-items: stretch; justify-content: space-between; }
.nav-links { display: flex; align-items: stretch; flex: 1; }
.nav-links a { min-width: 0; display: grid; place-items: center; padding: 0 20px; color: #fff; font-size: 14px; font-weight: 700; white-space: nowrap; transition: background 160ms ease, color 160ms ease; }
.nav-links a:hover, .nav-links a:focus-visible { background: var(--blue-soft); }
.nav-links a.active { color: #222737; background: var(--yellow); }
.nav-actions { display: flex; align-items: stretch; margin-left: 10px; }
.lang-btn, .menu-btn { border: 0; cursor: pointer; }
.lang-btn { min-width: 68px; padding: 0 15px; background: rgba(255, 255, 255, 0.12); color: #fff; font-weight: 800; }
.lang-btn:hover, .lang-btn:focus-visible { background: var(--yellow); color: #222737; }
.menu-btn { display: none; width: 50px; background: transparent; color: #fff; font-size: 23px; }
.mobile-brand { display: none; color: #fff; font-weight: 800; letter-spacing: 0.08em; align-self: center; }

.hero-slider { position: relative; background: #151827; overflow: hidden; }
.hero-slides { position: relative; aspect-ratio: 1920 / 450; min-height: 300px; max-height: 450px; }
.hero-slide { position: absolute; inset: 0; opacity: 0; visibility: hidden; transition: opacity 600ms ease; }
.hero-slide.active { opacity: 1; visibility: visible; }
.hero-slide img { width: 100%; height: 100%; object-fit: cover; object-position: center; }
.hero-dots { position: absolute; left: 50%; bottom: 18px; transform: translateX(-50%); z-index: 2; display: flex; gap: 10px; }
.hero-dots button { width: 12px; height: 12px; padding: 0; border: 2px solid #fff; border-radius: 50%; background: rgba(255, 255, 255, 0.35); cursor: pointer; box-shadow: 0 2px 8px rgba(0, 0, 0, 0.22); }
.hero-dots button.active { border-color: var(--yellow); background: var(--yellow); }
.sr-only { position: absolute !important; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0; }

.announcement-bar { border-bottom: 1px solid #eceef2; background: #fff; }
.announcement-inner { min-height: 52px; display: flex; align-items: center; gap: 20px; color: #5d626a; font-size: 14px; }
.announcement-label { min-width: 112px; color: var(--blue); font-weight: 800; border-right: 1px solid var(--line); }
.announcement-label::before { content: "◆"; color: var(--yellow-deep); margin-right: 9px; font-size: 11px; }
.announcement-text { flex: 1; }

.section { padding: 82px 0; }
.section-soft { background: var(--soft); }
.section-dark { background: var(--blue-deep); color: #fff; }
.section-dark .section-lead { color: #d1d4e5; }
.section-head { display: flex; align-items: end; justify-content: space-between; gap: 40px; margin-bottom: 36px; }
.section-title { margin: 8px 0 0; color: var(--ink); font-size: clamp(30px, 4vw, 42px); line-height: 1.25; font-weight: 780; }
.section-dark .section-title { color: #fff; }
.section-lead { max-width: 650px; margin: 0; color: var(--muted); }
.eyebrow { display: inline-flex; align-items: center; gap: 10px; color: var(--blue); font-size: 13px; font-weight: 800; letter-spacing: 0.1em; text-transform: uppercase; }
.eyebrow::before { content: ""; width: 22px; height: 3px; background: var(--yellow); }
.section-dark .eyebrow { color: var(--yellow); }

.legacy-overview { background: #f3f4f6; position: relative; overflow: hidden; }
.legacy-overview::before { content: ""; position: absolute; inset: auto 0 0; height: 48%; opacity: 0.28; background: linear-gradient(180deg, transparent, #e7e9ee); }
.overview-card { position: relative; z-index: 1; text-align: center; }
.legacy-title { display: inline-flex; align-items: center; gap: 16px; margin: 0 0 28px; font-size: 34px; font-weight: 500; }
.legacy-title::before, .legacy-title::after { content: ""; width: 120px; height: 1px; background: #b8bcc4; }
.legacy-title span { position: relative; padding: 0 8px; }
.legacy-title span::after { content: ""; position: absolute; left: 50%; bottom: -14px; width: 34px; height: 3px; transform: translateX(-50%); background: var(--yellow); }
.overview-copy { max-width: 990px; margin: 0 auto; color: #656a72; text-align: left; }
.overview-copy p { margin: 0; }
.overview-more { margin-top: 26px; }
.stats { margin-top: 44px; display: grid; grid-template-columns: repeat(4, 1fr); background: #fff; box-shadow: 0 10px 35px rgba(21, 24, 68, 0.06); }
.stat { min-height: 126px; display: flex; flex-direction: column; justify-content: center; align-items: center; padding: 20px; border-right: 1px solid #eceef2; text-align: center; }
.stat:last-child { border-right: 0; }
.stat strong { color: var(--red); font-size: 36px; line-height: 1.15; font-weight: 500; }
.stat span { margin-top: 5px; color: #777c83; font-size: 14px; }

.grid { display: grid; gap: 24px; }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
.product-card { overflow: hidden; background: #fff; border: 1px solid #e0e3e8; box-shadow: 0 10px 28px rgba(22, 30, 67, 0.07); transition: transform 180ms ease, box-shadow 180ms ease, border-color 180ms ease; }
.product-card:hover { transform: translateY(-4px); border-color: var(--yellow-deep); box-shadow: var(--shadow); }
.product-card .media { position: relative; display: block; height: 215px; overflow: hidden; background: #eceef1; }
.product-card .media::after { content: ""; position: absolute; inset: 0; opacity: 0; background: linear-gradient(135deg, rgba(241, 196, 60, 0.9), rgba(217, 168, 33, 0.72)); transition: opacity 180ms ease; }
.product-card:hover .media::after { opacity: 0.25; }
.product-card .media img { width: 100%; height: 100%; object-fit: cover; transition: transform 300ms ease; }
.product-card:hover .media img { transform: scale(1.035); }
.product-card .body { padding: 23px; }
.product-card h3 { margin: 0 0 10px; color: var(--blue-deep); font-size: 20px; line-height: 1.4; }
.product-card p { margin: 0 0 18px; color: var(--muted); font-size: 14px; }
.pattern-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.pattern-card { overflow: hidden; background: #fff; border: 1px solid #e0e3e8; box-shadow: 0 8px 24px rgba(22, 30, 67, 0.07); }
.pattern-card img { width: 100%; height: 190px; display: block; object-fit: cover; background: #f4f5f7; }
.pattern-card > div { padding: 16px 18px 18px; }
.pattern-card b, .pattern-card span { display: block; }
.pattern-card b { margin-bottom: 3px; color: var(--blue-deep); font-size: 17px; }
.pattern-card span { color: var(--muted); font-size: 13px; }
.card-link { display: inline-block; color: var(--blue); font-size: 14px; font-weight: 800; border-bottom: 2px solid var(--yellow); }
.card-link:hover { color: var(--yellow-deep); }

.btn { min-height: 44px; display: inline-flex; align-items: center; justify-content: center; padding: 10px 24px; border: 0; border-radius: 0; cursor: pointer; font-weight: 750; transition: background 160ms ease, color 160ms ease, transform 160ms ease; }
.btn:hover { transform: translateY(-1px); }
.btn-primary { background: var(--blue); color: #fff; }
.btn-primary:hover, .btn-primary:focus-visible { background: var(--yellow); color: #222737; }
.btn-light { background: #fff; color: var(--blue); }

.compliance-band { padding: 34px 0; background: var(--blue); color: #fff; border-top: 5px solid var(--yellow); }
.badges { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; }
.badge { min-width: 0; display: flex; align-items: center; gap: 14px; padding: 16px; background: rgba(255, 255, 255, 0.08); border: 1px solid rgba(255, 255, 255, 0.16); }
.badge-icon { width: 44px; height: 44px; flex: 0 0 auto; display: grid; place-items: center; background: var(--yellow); color: #222737; font-weight: 850; }
.badge strong { display: block; font-size: 14px; line-height: 1.35; }
.badge small { display: block; margin-top: 3px; color: #dce0f1; font-size: 12px; }

.feature-split { display: grid; grid-template-columns: 1.08fr 0.92fr; min-height: 490px; box-shadow: var(--shadow); }
.feature-image { min-height: 430px; background: url("../images/abrasion-applications.png") center / cover no-repeat; }
.feature-copy { display: flex; flex-direction: column; justify-content: center; padding: 52px; background: #fff; }
.feature-copy h2 { margin: 7px 0 16px; color: var(--blue-deep); font-size: 38px; line-height: 1.22; }
.feature-copy p { color: var(--muted); }
.chips { display: flex; flex-wrap: wrap; gap: 9px; margin: 20px 0 28px; }
.chip { padding: 7px 12px; background: #f1f2f6; color: var(--blue); border-left: 3px solid var(--yellow); font-size: 13px; font-weight: 750; }

.factory-banner { position: relative; min-height: 390px; background: url("../images/old-banner-2.png") center / cover no-repeat; }
.factory-banner::after { content: ""; position: absolute; inset: 0; background: linear-gradient(90deg, rgba(21, 24, 63, 0.12), transparent); }
.process { margin-top: 36px; display: grid; grid-template-columns: repeat(6, 1fr); border: 1px solid rgba(255, 255, 255, 0.18); }
.process-step { padding: 27px 14px; text-align: center; border-right: 1px solid rgba(255, 255, 255, 0.16); }
.process-step:last-child { border-right: 0; }
.process-step b { display: block; margin-bottom: 8px; color: var(--yellow); font-size: 13px; letter-spacing: 0.1em; }
.process-step span { font-size: 14px; }

.quality-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 44px; align-items: center; }
.quality-list { display: grid; grid-template-columns: 1fr 1fr; gap: 13px; }
.quality-item { padding: 20px; background: #fff; border: 1px solid var(--line); border-top: 3px solid var(--yellow); }
.quality-item b { display: block; color: var(--blue-deep); }
.quality-item span { color: var(--muted); font-size: 13px; }
.global-box { display: grid; grid-template-columns: 1.1fr 0.9fr; gap: 42px; align-items: center; padding: 52px; background: var(--blue-deep); color: #fff; border-left: 6px solid var(--yellow); }
.global-box .section-title { color: #fff; }
.world-tags { display: flex; flex-wrap: wrap; gap: 10px; }
.world-tags span { padding: 8px 12px; border: 1px solid rgba(255, 255, 255, 0.2); color: #e4e6f2; font-size: 14px; }

.contact-strip { padding: 45px 0; background: var(--yellow); color: #252945; }
.contact-strip .container { display: flex; align-items: center; justify-content: space-between; gap: 30px; }
.contact-strip h2 { margin: 0; font-size: 31px; }
.contact-strip p { margin: 4px 0 0; }
.contact-strip .btn { background: var(--blue); color: #fff; }

.page-hero { position: relative; overflow: hidden; padding: 74px 0 60px; background: linear-gradient(112deg, var(--blue-deep), var(--blue)); color: #fff; border-bottom: 5px solid var(--yellow); }
.page-hero::after { content: ""; position: absolute; right: -40px; top: -120px; width: 540px; height: 360px; opacity: 0.18; transform: rotate(-3deg); background: url("../images/hero-rolls.jpg") center / cover no-repeat; }
.page-hero .container { position: relative; z-index: 1; }
.page-hero h1 { margin: 8px 0 10px; font-size: clamp(38px, 5vw, 54px); line-height: 1.18; }
.page-hero p { max-width: 760px; margin: 0; color: #e0e2ef; }
.breadcrumb { color: #c2c5dc; font-size: 13px; }
.breadcrumb a { color: #fff; }

.content-two { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: start; }
.content-two > div > img { width: 100%; min-height: 360px; object-fit: cover; }
.prose h2 { margin: 6px 0 18px; color: var(--blue-deep); font-size: 34px; line-height: 1.28; }
.prose h3 { margin: 28px 0 10px; color: var(--blue-deep); font-size: 21px; }
.prose p { margin: 0 0 18px; color: #515760; }
.prose ul { padding-left: 21px; color: #515760; }
.legacy-prose p { text-indent: 2em; }
.legacy-prose .no-indent { text-indent: 0; }
.highlight-line { color: var(--red) !important; font-weight: 750; }

.table-wrap { overflow: auto; background: #fff; border: 1px solid var(--line); }
.spec-table { width: 100%; min-width: 760px; border-collapse: collapse; }
.spec-table th, .spec-table td { padding: 12px 13px; border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); text-align: center; font-size: 14px; white-space: nowrap; }
.spec-table th { background: var(--blue); color: #fff; font-weight: 750; }
.spec-table th small { display: block; margin-top: 3px; color: #dfe1ef; font-size: 11px; font-weight: 500; }
.spec-table th:first-child, .spec-table td:first-child { text-align: left; }
.spec-table tr:last-child td { border-bottom: 0; }
.spec-block + .spec-block { margin-top: 32px; }
.spec-title { display: flex; align-items: center; justify-content: space-between; gap: 20px; margin: 0 0 14px; }
.spec-title h3 { margin: 0; color: var(--blue-deep); font-size: 22px; }
.spec-source { color: var(--muted); font-size: 12px; }
.note { margin-top: 20px; padding: 16px 18px; background: #fff9e6; color: #625828; border-left: 4px solid var(--yellow); font-size: 13px; }

.contact-grid { display: grid; grid-template-columns: 0.9fr 1.1fr; gap: 44px; }
.contact-card { padding: 38px; background: var(--blue-deep); color: #fff; border-top: 5px solid var(--yellow); }
.contact-card h2 { margin: 0 0 14px; font-size: 30px; }
.contact-card .line { padding: 15px 0; border-top: 1px solid rgba(255, 255, 255, 0.14); }
.contact-card small { display: block; color: #c2c5da; }
.wechat-card { margin-top: 22px; padding: 18px; display: flex; align-items: center; justify-content: space-between; gap: 20px; background: #fff; color: var(--ink); }
.wechat-card small { margin-bottom: 6px; color: #62677b; font-size: 13px; }
.wechat-card strong { display: block; font-size: 17px; line-height: 1.45; }
.wechat-card img { width: 172px; max-width: 48%; height: auto; display: block; background: #fff; }
.contact-form { display: grid; gap: 14px; }
.contact-form label { font-size: 14px; font-weight: 750; }
.contact-form input, .contact-form textarea { width: 100%; padding: 12px 13px; background: #fff; border: 1px solid #cfd3da; border-radius: 0; }
.contact-form textarea { min-height: 150px; resize: vertical; }
.download-box { display: flex; align-items: center; justify-content: space-between; gap: 28px; padding: 30px; background: #fff; border: 1px solid var(--line); border-left: 5px solid var(--yellow); }
.download-box h3 { margin: 0 0 5px; color: var(--blue-deep); }
.download-box p { margin: 0; color: var(--muted); }

.footer { padding: 54px 0 0; background: #111438; color: #c8cada; }
.footer-grid { display: grid; grid-template-columns: 1.3fr 0.8fr 0.8fr 1.1fr; gap: 38px; }
.footer h3, .footer h4 { margin: 0 0 14px; color: #fff; }
.footer h3 { font-size: 20px; }
.footer p, .footer a { font-size: 13px; }
.footer-links { display: grid; gap: 8px; }
.footer a:hover { color: var(--yellow); }
.footer-bottom { margin-top: 40px; padding: 18px 0; background: rgba(0, 0, 0, 0.18); color: #999db8; font-size: 12px; }
.footer-bottom .container { display: flex; justify-content: space-between; gap: 20px; }

@media (max-width: 1080px) {
  .company-name strong { font-size: 21px; }
  .service-block strong { font-size: 20px; }
  .nav-links a { padding: 0 12px; font-size: 13px; }
}

@media (max-width: 900px) {
  .corporate-inner { min-height: 76px; }
  .service-block { display: none; }
  .company-name strong { white-space: normal; }
  .mobile-brand { display: flex; }
  .nav { position: relative; min-height: 52px; align-items: stretch; }
  .nav-links { display: none; position: absolute; top: 52px; left: 0; right: 0; z-index: 10; padding: 8px 20px 18px; background: var(--blue-deep); box-shadow: 0 18px 35px rgba(10, 11, 44, 0.3); }
  .nav-links.open { display: grid; }
  .nav-links a { min-height: 44px; display: flex; justify-content: flex-start; padding: 0 14px; }
  .menu-btn { display: block; }
  .hero-slides { min-height: 300px; }
  .hero-slide img { object-position: center; }
  .grid-3, .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .pattern-grid { grid-template-columns: repeat(2, 1fr); }
  .stats, .badges { grid-template-columns: 1fr 1fr; }
  .stat:nth-child(2) { border-right: 0; }
  .stat:nth-child(-n + 2) { border-bottom: 1px solid #eceef2; }
  .feature-split, .quality-grid, .global-box, .content-two, .contact-grid { grid-template-columns: 1fr; }
  .feature-image { min-height: 390px; }
  .process { grid-template-columns: repeat(3, 1fr); }
  .process-step:nth-child(3) { border-right: 0; }
  .process-step:nth-child(-n + 3) { border-bottom: 1px solid rgba(255, 255, 255, 0.16); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 640px) {
  .container { width: min(var(--max), calc(100% - 28px)); }
  .corporate-inner { min-height: 72px; }
  .legacy-marks img:first-child { width: 62px; height: 34px; }
  .legacy-marks img:last-child { width: 48px; height: 38px; }
  .corporate-brand { gap: 10px; }
  .company-name strong { font-size: 17px; }
  .company-name small { display: none; }
  .lang-btn { min-width: 62px; }
  .hero-slides { aspect-ratio: auto; min-height: 260px; }
  .hero-slide img { object-fit: cover; object-position: center; }
  .hero-slide:first-child img { object-position: 48% center; }
  .announcement-inner { align-items: flex-start; gap: 12px; padding: 13px 0; }
  .announcement-label { min-width: 88px; }
  .section { padding: 62px 0; }
  .section-head { align-items: flex-start; flex-direction: column; gap: 16px; }
  .legacy-title { font-size: 29px; }
  .legacy-title::before, .legacy-title::after { width: 42px; }
  .stats, .badges, .grid-3, .grid-4, .quality-list, .footer-grid { grid-template-columns: 1fr; }
  .stat { border-right: 0; border-bottom: 1px solid #eceef2 !important; }
  .stat:last-child { border-bottom: 0 !important; }
  .product-card .media { height: 205px; }
  .pattern-card img { height: 165px; }
  .feature-image { min-height: 300px; }
  .feature-copy { padding: 34px 24px; }
  .feature-copy h2 { font-size: 32px; }
  .process { grid-template-columns: 1fr 1fr; }
  .process-step { border-bottom: 1px solid rgba(255, 255, 255, 0.16) !important; }
  .process-step:nth-child(even) { border-right: 0; }
  .factory-banner { min-height: 280px; }
  .global-box { padding: 34px 24px; }
  .contact-strip .container, .download-box, .footer-bottom .container { align-items: flex-start; flex-direction: column; }
  .wechat-card { align-items: flex-start; flex-direction: column; }
  .wechat-card img { width: min(220px, 100%); max-width: 100%; }
  .page-hero { padding: 62px 0 48px; }
  .content-two > div > img { min-height: 260px; }
  .spec-title { align-items: flex-start; flex-direction: column; gap: 4px; }
}